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Ruby | Matrix cofactor_expansion() function
  • Last Updated : 07 Jan, 2020

The cofactor_expansion() is an inbuilt method in Ruby returns the cofactor_expansion of the given matrix along a given row or column. In other words, it returns the Laplace expansion.

Syntax: mat1.cofactor_expansion(row: num or col:num)

Parameters: The function accepts one mandatory parameter row or coloum whose cofactor_expansion is returned.

Return Value: It returns the cofactor-expansion of the given matrix along the given row or column.

Example 1:






# Ruby program for cofactor_expansion() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 = Matrix[[1, 21], [31, 18]]  
  
# Prints the value of mat1.cofactor_expansion
# first row 
puts  mat1.cofactor_expansion(row:1)

Output:

-633

Example 2:




# Ruby program for cofactor_expansion() method in Matrix
  
# Include matrix 
require "matrix"
  
# Initialize a matrix 
mat1 =  Matrix[[13, 1, 5], [12, 1, 5], [11, 2, 5]] 
  
# Prints the value of mat1.cofactor_expansion
# first row 
puts  mat1.cofactor_expansion(column:0)

Output:

-5
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